Stationary die for rivet heads



Jan.-16, 1923. 1,442,675. C. LEMBCKE. STATIONARY 015 FOR RIVET HEADS.

FILED JAN 19. 1922. 2 SHEETS-SHEET I.

E'IIIIII ilzaemor' CLe hire Jan. 16, 1923.

. 1,442,675., C. LEMBCKE.

STATIONARY DIE FOR RIVET HEADS. FILED JAN-19. 192 2.

2 SHEETS-SHEET 2- Patented Jan. 16, 1923. p i

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(l ARI LEMIBCKE, 0F ALTOINA, GERMANY.

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Application filed January 19,1922. Serial in). 530,399.

To all whom/it may concern:

Be it known that I, CARL LnMBoxE, a citizen of the German Republic, residing at Altona, Germany, have invented certain new and useful Improvements in aStationary Die for Rivet Heads (for which I have filed an application in Germany, September 27, 1920) ,of which the following is a specification. y

This invention relates to a stationary die for rivet heads which consists of a bolt designed to receive the rivet headand elastically supported by an abutment adapted to be displaced in the direction of the axis of the bolt, in such a manner that at the riveting the counter action takes place atfirst rigidly without the spring-likefaction by the corresponding adjustment of the abutment whereupon, in consequence of the shrinking of the mass of the rivet head when the same is cooling, the counter action becomes butler-like owing to theinsertion ot thefspring action. v In order that the invention may be clearly understood, I shall proceed to describe the same with reference to the form of construction shown by way of example on the accompanying drawing, wherein Fig. 1 is a side elevation partly in section showing the device in the position of rest. Fig. 2 is a similar view as Fig. lshowing the device in the working position.

Fig. 3. is a cross section on line '3.3 of Fig 1.

4. is the front elevation of Fig. 1. Fig.5 is a cross section on line 55 of Fig. 1. h

Fig. 6 shows in plan view and Fig. 7 in cross section on line 77of Fig. 6 the bottom of the abutment for the bolt designed to receive the matrix of the rivet head.

Fig. 8 shows in plan view and Fig. 9 in longitudinal section on line 9-9 of Fig. 8

the web rigidly connected with the bottom of the abutment adapted to be adjustedwithin determined limits upon-the rod together with said abutment.

Fig. 10 showsin longitudinal section the lock for locking the'stationary die in the lifted position.

2 1 of arm 16 is held in engagement with manner with the web 3 and screwed into the sleeve l or secured against accidental rotation in any other manner. Between the nner edge 6 and the bottom 5 ofsleeve s; the

flange 7" of a bolt 7 is located. This flange 7 has play between the bottom plate 5 and the inner edge 6 of sleeve 1. The bolt 7 has two longitudinal borings 8 and 9 which are .separatedby a partition 10. The boring 8 serves to take up the upper end of shaft 1 and a spring 12 which is inserted with a determined tension. The one end of the spring 12 rests upon the bottom plate 5 ofsleeve l and its other end against the wall 10 of bolt 7. The boring 9.is designed to take up the exchangeable stationary die 13 for the rivet head.

In the longitudinal slot 2 of shaft 1 a cam 14 is mounted pivotable around a pivot pin 15, This cam 1 1 has an arm 16 with a handle 17 at the outer end. rod 18 guided upon the arm 16 terminates in the handle '17 of arm 16 with its outer end which has the shape of a handle 19. A pawl 20 is pivotably mounted upon the inner end of rod 18. Rod 18 is guided in the cross part 17 of the handle 17 and in an eye 21 which is mounted in an opening 16 of arm 16 by means of a stud 21 and located in one end of a sleeve or of a bow-shaped cup 22 which is connected with arin16 by screws 23. In the other end of this cup 22 the pawl 20 is guided which is pi-votally connected with rod 18 by a pivot pin or in any other convenient manner. A spring 26 arranged between the pawl 20 and the eye 21 presses the pawl 20 against a bracket 24 tixedby a stud 25 in the arm 16 and forming a further guide for the pawl 20.

Laterally of the slot 2 of shaft 1 in which the cam 14: is located teeth 27 are arranged in shaft 1 in an arc the center of which is situated in the longitudinal axis of the bolt 15 around which the cam 14; can pivot freely. The pawl 20, the movement of which with regard to teeth 27 islimited by the bracket one of the gaps between the teeth by the action of spring 26 so that the cam 1.4: is secured in a determined position.

If the pawl 20 is pulled away from the teeth 27 of shaft 1 by a pull exerted upon the handle 19 of rod 18 in opposition to the action of spring 26, the arm 16 and the cam 14 can be pivoted around stud 15 to move from the position of rest (Fig. 1) into the working position (Fig. 2), the cam 1 f act-- ing upon the web 3 and efiecting the displacement of the parts 4:, 'Z, 13 upon the shaft 1.

If the shaft 1. bears upon a fixed support 30 .(Fig. 2) andthe displacement is effected forsuch an amount that the matrix 13 takes up thehead of the rivet 29 which has been inserted in the meantime, only the sleeve will be, moved further whereby the spring 12, which had already been under tension will be tensioned further. If now the inner end 7 of bolt 7 comes in contact with .the bottom plate 5 of sleeve hthe parts 4-,

7, 13 cannot be displaced further, the released pawl 24: locks the cam 14 in its position and the riveting can begin, a strong resistance being opposed to the riveting at first.

ltfthe mass of therivet head cools and shrinks consequently some play is produced between theend 7 of the bolt 7 and the bottom plate 5 of sleeve 4-, wherefrom results that, if the rivet is being struck the bolt 7 pushes strongly against the bottomv plate 5 of sleeve 4, so that the sleeve a recoils against the bolt 7 followed directly by the action of spring 12 A perfect riveting is thus ensured which means that the rivet head does tightly fitupon-the riveted part.

The lower end ofshaft lis preferably arranged so, that it can take up a supporting stud 28 adapted to receive a tubular extension, wherefrom results the possibility to lengthen the stationary die according to requirement.

s The initial or first positioning of the die member to-hold a rivet which is usually red hot, is such that a stationary and rigid support for the rivet is formed, but as the rivet cools before the rivetingoper'ation is.

completed, the head shrinks and leaves a play between the head and the die from the initial position, which is compensated for by providing the spring between the bolt and the shaft, which forces the bolt outwardly as the rivet head shrinks.

I claimzi y 1. A stationary die for rivetheads come prising in combination a tubular bolt having means adapted to fita rivet head and having an outwardly flanged lower end, an abutment for said bolt consisting of a sleeve having an inwardly flanged upper end, a shaft upon whichsaid,sleeve-shaped abutment is guided mounted in said tubular bolt,

a spiral spring inserted between said bolt and said abutment, and a device for raising said sleeve upon said shaft and for looking the same in the raised position.

2. A. stationary (lie for rivet heads com-v prising in combination a tubular bolt having means serving as matrix for the rivet head, and having an. outwardly flanged lower end, an abutment for said bolt consisting of a sleeve having an inwardly flanged upper end, a shaft upon which said sleeve-shaped abutment is guided mounted in said tubular bdltaind having a longitudinal transverse slot a cam mounted in the longitudinal slot of said shaft, a handle for said cam, a pawl pivotally mounted in the innerend of said handle, and ratchetteeth for said shaft with which said-pawl engages.

3. A stationary die for rivet heads comprising in' combinationa tubular bolt having means servingas matrix for the rivet head and having an outwardly flanged lower end, an abutment for said bolt consisting of a sleeve having an inwardly flanged upper end, a shaft upon which said sleeveshaped abutment is guided'mounted in said tubular bolt and having a longitudinal transverse slot, a cam mounted in-thelongitudinal slot of said shaft, a laterallyextending arm for said cam, a pawlpivotably fixed at the inner end of said arm, a spring acting upon'said pawhfand ratchtfte'eth on said shaft with which; said pawl engages under the action of said spring.

A stationary die for rivet 'heads comprising in combination atubular bolt having means serving as matrix for the rivet head and having an outwardly flanged lower end, an. abutment for said bolt cons sting of a' sleeve having an inwardly flanged upper end, a shaft upon whichs aidisleeve-shaped abutment is guided mounted in said tubular bolt and having a longitudinal transverse slot, a crossbar 1n thebottoin end offsaid sleeve-shaped abutment traversing the longitudinal slot of said shaft, a cam mounted in the longitudinal slot of said shaft, designed to act upon said cross bar of the sleeveshaped abutment, means for oscillatingsaid cam so that it raises the said abutment and means for locking said cam in theraised position. i i

A stationarydie for'rivet heads, comprising a bolt formed at one end to receive a rivet head, a, fixed abutment for said bolt having adjustable means adaptedto engage the bolt in any one of its adjusted positions and hold it in fixed initial position, and means adapted to engage thebolt for helding itagainstthe rivet head ina position beyond the initial'position.

6. A, stationary-.dieifor rivet heads, c'omprising a bolt formed at one end'toreoeive holding it in fixed initial position, and tenthe bolt resilient means between the said In testimony whereof I a fiix my signature means and the bolt, and cam operated means in presence of two witnesses.

carried by the abutment and edapted'to 0perate said means for engaging'the bolt and CAR-L LEMBCKE. [L. s]

sioning the resilient means fer holding the WVitnesses: bolt in engagement With a rivet head sub- FRIEDRICH JULIUS TOTHS, sequent t0 the initial position. E. KASPAREK. 

